Do newborns recognize their mother's voice?

What the studies found

Newborns prefer their mother's voice. In 1980, researchers DeCasper and Fifer gave newborns a pacifier wired to a tape player. Sucking one way played the baby's own mother reading a story. Sucking another way played a different woman reading the same story. In this small study of 10 babies under 3 days old, the babies learned the sucking pattern that brought up their own mother's voice and chose it more often.

Those babies had already spent a few hours with their mothers after birth, so that study alone can't prove the learning happened in the womb. Later studies fill the gap.

Before birth, the heart reacts. In a study of 60 full-term babies in the womb in Hangzhou, China, led by Barbara Kisilevsky of Queen's University in Canada, researchers played a recording of a woman reading a short passage. For half the babies it was their own mother; for the other half, a stranger. Heart rates went up for the mother's voice and down for the stranger's, and both changes lasted for minutes. Same passage. Different voice. Different reaction.

Why your voice is the one they know

Babies first respond to sound at about 19 weeks, and by 27 weeks almost all respond to low tones. The womb filters out high sounds and lets the melody and rhythm of speech through. It's clearer in there than you might think: when adults listened to sound recorded inside a pregnant woman's uterus, they could pick out about 30% of French speech sounds, and the melody of the voice came through even better.

Your voice reaches the baby two ways. It travels through the air and the belly wall like everyone else's. It also travels through your own body, from your throat and chest, through bone and tissue. Recordings from inside the womb pick up the mother's voice more strongly than other voices. For months, yours is the voice your baby hears most, and loudest. More detail in when babies can hear in the womb.

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Babies also know your language, and your stories

• The sounds of your language. In Tacoma, Washington, and Stockholm, Sweden, newborns about 30 hours old reacted differently to vowels from a foreign language than to vowels from their own (40 babies in all).
• The melody of your language. Researchers in Germany and France analyzed the cries of 60 newborns aged 3 to 5 days. French babies tended to cry with a rising melody and German babies with a falling one, matching each language.
• Your stories. Newborns whose mothers read one story aloud twice a day in the last six weeks of pregnancy preferred that story after birth, even when a different woman read it. See reading to your baby in the womb.

None of this means a newborn understands words. It means the brain has already filed away the sounds it heard most: your voice, your language's tune, your favorite rhyme.

What about Dad's voice?

Here's the honest picture. In a Canadian study, fathers read a story to the bump every day for a week. Before birth, the babies' heart rates rose to a recording of the father's voice just as they did to the mother's, so Dad's voice was getting through. After birth, though, the newborns preferred their mother's voice. An older study found newborns showed no preference for their own father's voice over another man's.

The likely reason: a partner's voice has to come from outside, through air and the belly wall. The mother's voice has a private line through her own body, all day.

So should partners bother? Yes. Bump talk makes talking to a tiny person feel normal, and after birth is where the real payoff is. In the first hour, a partner can take the baby onto their own bare chest if the mother gets sleepy, say hello and hum something. In the months after, everyday talk and play matter: in a Pennsylvania study of two-year-olds, the variety of words fathers used was linked to children's language a year later. One study, and a link rather than proof, but an easy lesson: use real, specific words. See dad skin-to-skin for the first hours.

How to use your voice before and after birth

Before birth: talk to the bump the way you'd talk to someone you love in the next room. Narrate your day, read aloud, hum and sing. Speak your home language, or both if you use two. Ten minutes a day is plenty, and no recordings or belly headphones are needed.

After birth: your voice is a tool for calm and connection.

• Talk and sing during skin-to-skin and the first feeds.
• Use the same womb story or song at bedtime, in the same calm voice.
• Try parentese: real words, a slightly higher pitch, slow stretched vowels and a warm face, with pauses so your baby can "answer." In a University of Washington trial, coaching parents in this style was linked to children using about 100 words at 18 months, compared with about 60 in the control group.
• Keep it live. Babies learn speech sounds from a real person far better than from a screen or audio.

Your baby already knows you. Every chat, song and story builds on that head start.

Go deeper

Grow a Genius

In the book: Chapter 10: Second Trimester: The Baby Starts Listening

Chapter 10 tells the full story of the voice studies and turns them into a daily bump-talk routine, with a partner's role and the touch game for first kicks, and Talk to Me: 101 Conversation Games carries the conversation on from birth.

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